diff --git a/src/jonase/kibit/rules.clj b/src/jonase/kibit/rules.clj
index 4a810d4..2035ce9 100644
--- a/src/jonase/kibit/rules.clj
+++ b/src/jonase/kibit/rules.clj
@@ -29,6 +29,7 @@
 (def rule-map {:control-structures control/rules
                :arithmetic arith/rules
                :collections coll/rules
+               :perf perf/rules
                :misc misc/rules})
 
 ;; TODO: Consider a refactor for this into a function
diff --git a/src/jonase/kibit/rules/performance.clj b/src/jonase/kibit/rules/performance.clj
index 9740680..141df35 100644
--- a/src/jonase/kibit/rules/performance.clj
+++ b/src/jonase/kibit/rules/performance.clj
@@ -2,4 +2,6 @@
   (:use [jonase.kibit.rules.util :only [defrules]]))
 
 (defrules rules
-  [(reduce + ?coll) (apply + ?coll)]) 
\ No newline at end of file
+  ;; reduce on var-arg functions
+  [(reduce + ?coll) (apply + ?coll)])
+